marbles (Noun) — A children's game played with little balls made of a hard substance (as glass).
marbles (Noun) — The basic human power of intelligent thought and perception. ex. "he still had all his marbles and was in full possession of a lively mind"
marbles (Noun) — A hard crystalline metamorphic rock that takes a high polish; used for sculpture and as building material.
marbles (Noun) — A small ball of glass that is used in various games.
marbles (Noun) — A sculpture carved from marble.
marbles (Verb) — (handicraft) paint or stain like marble. ex. "marble paper"